الفهرس 
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Abstract
Two experiments were conducted at the protected cultivation center, Faculty of Agriculture, Kafrelsheikh University, Egypt in the late summer season in 2017 and 2018 under Spanish style net-house. The aim of this study was to evaluate different cucurbit rootstocks (Ferro, Cobalt, VSS- 61 F1, Bottle gourd, and Super Shintoza) and foliar applications of anti-stress compounds (H2O2 at 20 mmol l-1, Nano-Se at 25 mg l-1, and Si at 200 mg l-1), on the growth, some physiological and chemical aspects, yield and fruit quality of cucumber (Cucumis sativus L.) under combined salinity and heat stresses. Grafted cucumber onto VSS- 61 F1 rootstock had the best vegetative growth, chlorophyll content and the lower abortion rate. It had also higher enzyme activates (CAT and POD), proline content and increasing nutrient contents particularly N, P, K, and Mg, as well as Se in leaves and Si in fruits in both seasons followed by Ferro and Cobalt rootstocks. Furthermore, grafted cucumber onto VSS- 61 F1 rootstock showed the best fruit quality and highest values of marketable and total yields compared to other treatments, while grafted onto Ferro rootstock produced the highest early yield. Grafted cucumber onto VSS- 61 F1 rootstock produced the highest values of net income and economic efficiency under combined salinity and heat stresses. Foliar application of Nano-Se resulted the highest values of vegetative growth parameters. While application of Si was increased chlorophyll fluorescence and chlorophyll content. Also, Si application increased activity of CAT, POD, proline level and RWC as well as recorded the highest fruit quality and the early, marketable and total yields in cucumber plants. The contents of N, P, K, and Mg, as well as Se in leaves and Si in fruits were increased by applying Si. Generally, spraying Si on cucumber plants recorded higher net income values and economic efficiency under combined salinity and heat stresses.